Stuffing-box.



P. o, KRGER.

STUFFING BOX.

APPLICATION FILED DEO.15, 1909.

Patented Dea-13, 1910.

2 SHEETS-SHEET 1.

F.0.KRGER- STUFFING BOX. APPLICATION FILED DEO. 15, 1909.

978,310. 4 l Patented Dec.13,1910.

l2 SHEETS-SHEET 2.

FRIEDRICH CARL KRGER, 0F HANOVER, GERMANY.

STUFFING-BOX.

Specification of Letters Patent.

Patented Dee. v13, 1910.

Application led December 15, 1909. Serial No. 533,246.

To all whom it may concern:

Be it known that I, FRIEDRICH CARL KRGER, a subject of the King of Prussia, German Emperor, and resident of 1 1Waldstrasse, Hanover, in the German Empire, have invented certain new and useful Improvements in Stuffing-Boxes, of which the following is a specification.

The subject of the present invention is an improved stufing-box of the character of labyrinth-stuffing boxes which is shorter in its length and more simple than the known stuffing boxes of that kind, as the old labyrinth-stuifing boxes must have a great number of grooves or chambers, as the tightening of same depends only from the number and length of the grooves.

According to the present invention the tightening surfaces are arranged vertically to the axis, viz. on rings which are fastened to and rotating with the shaft, but which rings at the same time are pressed axially so as to bear against fixed counter-faces. These counter-faces are formed by the walls ofchambers, and the rings are arranged in these chambers preferably in such a way that the one of the packing rings is fastened tightly to the shaft or to a shaft-surrounding shell, while the other ring rests in a tightly fitted manner upon the nave-part of the first ring. The first ring is fastened to the shaft in such a way, as to rotate with same, and the second ring is taken along by the first one by any of the later described means. Between both rings there are inserted means which have the tendency to press the rings away from each other, so as to bear permanently against the front faces of the chamber walls. For this pressing from each other of the rings there may be used self-tension rings which are in the space between both packing rings and which ten- `sion rings bear against inclines of the packing rings in such a way that their radial spring-tension produces an axial component upon the packing rings. The tension of the spring-rings may be aided by other additional springs, for instance coiled springs,

and further in the case of quickly rotating shafts the centrifugal force upon the tension ring will act in assistance of their natural tension. There may be used even coiled springs, the axis of which may be parallel to the shaft, in substitute for the rings for the pressing of the packing rings against the walls.

In the accompanying drawings Figure l shows a longitudinal section through a stufling box, Fig. 2 a cross section according to the dash-dotted line A--B of Fig. l, Figs. 3 and 4 show a corresponding longitudinal and transverse section of another embodiment. Figs. 5, 6 and 7 are detail views showing various arrangements of springs.

In the first example according Figs. 1 and 2 the rotating shaft a of the machine passes through the cover of the cylinder. Some rings c of angle-section form the chambers d, whereby the disk parts d of these anglerings c do not touch the shaft a. On the shaft a there are fastened the tightening rings f of angle-section, so that their-naveparts f may slide axially but cannot move radially in consequence of 'the key-connection e between both parts. Further there are supported by the naves f rings (7 of angle-section, whereby the plugs z, or keys in the grooves of the naves g of said rings allow an axialmovement of the rings g with reference to the rings f, but prevent a radial movement or turning movement between those parts. The ring-shaped free space i between both the tightening rings f and g is shaped roof-like, and a spring-ring fm, presses against the inclines c of said rooffaces. The tightening surfaces of the stuffing box are arranged between the radial planes of the rings f and g and the radial plane of the disk-part d of the chamberwalls d. The action of the springs m may be assisted by additional coiled spring rings, which are inserted between the nave g and the inner wall of said rings m.

According to the embodiment of Figs. 3 and fl there are used again spring rings m rings f2 and g2 which rings however are not supported directly on the rotating shaft a', but on a sleeve 0 which is shrunk on the shaft a. The connection between the rings g2 and the rings f2 is not effected by plugs 71 as in the foregoing exam le, but by the teeth e ze, which are former: on the inclined roof-parts 7: of the rings f2 and g2. Fig. 4: shows the front view of such teeth.

The split spring rings m and m may be supported and assisted by a series of spiral springs m as shown in Fig. 5. As shown in Fig. 6 the coiled split spring ring m or m and corresponding coned surfaces on the flanges f and g or f2 and g2 may be dispensed With and the flanges may be pressed apart by a single coiledspring f4, or instead of a single coiled spring f4 the flanges yf and g or f2 and g2 ymay be pressed apart by a series of spiral springs f5, of Whichvone is shown in section in Fig. 7. The springs f5 may be supported in a suitable manner on one of the flanges, for instance by pins f6 on the flans@ f- In both examples the readjusting of the stulling-box by the flange of the gland and the other details are performed in the Well known manner.

claim;-

l.V In a stulllng box for rotary shafts, the combination Withthe shaft of a divided casing, means for connecting the` parts of said casing together, a plurality of internal radial flanges on said casing, a pair of rah dial flanges surrounding said shaft and located between la pair of flanges on saidf casing-means for connecting said flanges to said shaft so as tocause said anges tol rotate with said shaft W-'lfle permitting an axial ina-vement of said flanges With respectto said, shaft sd as to, enable each of said lastI mentioned flanges to make contact Witha side face of the correspondingfflange o n said casi-ng and elastic inea-ns tendingto maintain Contact between the said pa-ir effi-anges on said shaft and the flanges on said casing.

2. In a stuffing box for rotary shafts, the combination with, the sha-ft of a sectional casing, comprising a plurality of internal radial flanges, means for connecting the secf tions of said casing together, a pair of r-adial flanges surrounding said shaft and located between a pair of flanges Aonsaid cas-` ing, meansffor connecting said flanges to said shaft so as to cause. said flanges to rotate with said shaft While permitting an axial movement of said flanges With respect to said shaft soas to enable each of said last mentioned flanges to make contact with a side face of the corresponding flange on said casing and elastic means tending to maintain contact between the said pair of flanges on said shaft and the flanges on saidl casing.

3,. In astuffing box for rotary shafts, the combination with the shaft of a divided cas-` ing, means for connecting the parts of said i casing together, a plurality of internal radiali flanges` on said? casing, a pair of radialI flanges surrounding said` shaft and located betweena pair of flanges on said casing,r means for connecting said flanges to said shaft While permitting an axial mozvement of said flanges with respect to, said shaft so,k as te; enable each; of said last mentionedl flanges to make contact With a side face ofl the corresponding flange on said casing, a

split spring ring located between said pair of flanges a coned surface at the outer periphery of said ring at each side thereof and correspoijiding co aerating coned surfaces on adjacent faces of said pair of flanges.

4. In a stufling box for rotary shafts, the combination With the shaft of a divided casing, means for connecting the parts of said casing together, a plurality of internal radial flanges on said casi-ng, a collar on said shaft located between a pair of flanges on said casing, a radial flange on said collar, means for connecting said collar to said shaft so as to cause said4 collar to rotate With said shaft AWhile permitting an axial movement of said .collar with respect to said shaft, a second collar on the first named collar, a radial flange on said second collar, means for causing said collars to rotate together While permitting va relative axial movement, and elastic means tending to maintain contact bev tween the flanges on. said collars and the said v pair of flanges on said casing.

5. In a stuffing box for rotary shafts, the

combination with the shaft `of a divided casing, means for connecting the parts of said Leasing together, a plurality of internal radial flanges on said casing,y a collar on said shaft located between a pair of flanges on ,s said casing', a radial flange on 'said collar,

means,- for coimecting said. collar to. said shaft so as to. cause said collar to rotate with said shaft While permitting an axial movement of said collar with respect to said shaft, a second collar on the rst named collar, a radial: flange on said second collar,

f means for causing said collars to rotate together While permitting a relative axial movement, a split spring ring located between. the pair of flanges on said collars, a coned surface at the outer periphery of said lring at each side thereof and corresponding cooperating coned surfaces on adjacent faces of the flanges on ysaid collars.

64. In a stuffing box for rotaryshafts, the

combination with the shaft of a divided casing, means for connecting the parts of said casing together, a plurality of internal radial flanges onl saidy casing, a collar on said shaft located between a pair off flanges on ssaid; casing, a radial flange'on said collar, means for connecting said.4 collar to said shaft so as to cause said collar to rotate with said shaft While permitting an axial movement of said collar with respect to said shaft, a second collar on the first named collar, a radial flange on saidsecond collar, means for causing said collars to rotate together While permitting a relative axial movement, a split spring ringV located between the pair of flanges on said; collars, a i coned surface at the outer periphery of said jring at each side thereof, and a series of radiallyv arranged spiral springs, adapted to support and assist the said split spring rino.

7. In a stuffing box for rotary shafts, the combination With the shaft of a divided casing, means for connecting the parts of' said easing together, a plurality of internal radial flanges on said easing, a sleeve secured to said shaft, a pair of radial flanges surrounding said sleeve, and located between a pair of flanges on said casing, means whereby said pair of fianges are caused to rotate with said sleeve While permitting an aXial movement of said pair of flanges so as to enable each of said pair of flanges to make contact with a side face of the correspondmg flange on sald easing and elastic means to maintain Contact between the said pair i5 FRIEDRICH CARL KRGER.

Witnesses:

OTTO SDCKM, RoBT. J. THOMPSON. 

